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Part Number: OPA172
our client design opa172 as attached, and lastet question we got the answer from Ronald Michallick as below link:
Assuming headphone is a 32 ohm load. there will be more voltage loss across R70 and C73. Xc=1/(6.28*2.2uF*1kHz)= 72 ohms. Headphone voltage will be 3Vpp * 32 ohms / ( 32 ohms + 50 ohms + 72i ohms) 3Vpp * 32 ohms / ( 82 ohms + 72i ohms) 3Vpp * 32 ohms / sqrt ( 82^2+ 72^2) ohms 0.88Vpp ; this is close to actual green signal, so problem identified.
so OPA172 is correct soultion? and how to enhance gain ,we cannot assign customer use low resisger headphone to test.
If any suggestion, Please advise me.
TI Designs – Precision: Verified DesignSingle-Supply, Electret Microphone Pre-AmplifierReference Design
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